Nested View in child state

In my Ionic app, I have a page "order.html" in child state. I'd like to have this page to load two other pages ("orderheaderdetail.html" and "orderitemdetail.html"). I defined "ui-view" to load the two other pages (e.g. "orderheaderdetail" and "orderitemdetail"). I don't know if this is the correct practice. But it seems it does not work. The html of page "A" is as follow :